-american vote in places like florida where vice presidentjoebidendeftedobama ease relationship with israel. >> i'm not going to talk about israel today. but i want to say one thing. i just want to tell you how proud i am, how proud i am to stand shoulder-to-shoulder with a guy who has done more for israel's physical security than any president of the eight i've served with. >> reporter: switching gears to court the state's senior citizens, biden said romney's plan to lower taxes would force the nation's elderly to pick up the tab. >> their plan they have for social security, the one they have now, would raise taxes on your social security. >> reporter: romney, who has accused the president of misleading the public on the subject of taxes repeated his pledge on the issue. >> i will not raise taxes on middle income americans. >> reporter: less than one week from his debate with the president, romney is trying to expand the election map boldly predicting twice during his visit to pennsylvania that he can win here. >> you know, i've got a little secret here. and that is that obama campaign thi